Where is this and how hard is it to change?
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1997 Ford F-150 Question: My 1997 F-150 4.2 shows codes P1537 & 1538. IMRC valve stuck open. How to change
its a vac diapharm located behind the eng blk against firewall. the problem can be vac related or vac resivoir or rod clips,diapharms themselves or siganl
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